Enhanced longevity of the spin helix in low-symmetry quantum wells

Abstract

In a semiconductor, collective excitations of spin textures usually decay rather fast due to D'yakonov-Perel' spin relaxation. The latter arises from spin-orbit coupling, which induces wave-vector-dependent spin rotations that, in conjunction with random disorder scattering, generate spin decoherence. However, symmetries occurring under certain conditions can prevent the relaxation of particular homogeneous and inhomogeneous spin textures. The inhomogeneous spin texture, termed as persistent spin helix, is especially appealing as it enables us to manipulate the spin orientation while retaining a long spin lifetime. Recently, it was predicted that such symmetries can be realized in zinc-blende two-dimensional electron gases if at least two growth-direction Miller indices agree in modulus and the coefficients of the Rashba and linear Dresselhaus spin-orbit couplings are suitably matched [PRL 117, 236801 (2016)]. In the present paper, we systematically analyze the impact of the symmetry-breaking cubic Dresselhaus spin-orbit coupling, which generically coexists in these systems, on the stability of the emerging spin helices with respect to the growth direction. We find that, as an interplay between orientation and strength of the effective magnetic field induced by the cubic Dresselhaus terms, the spin relaxation is weakest for a low-symmetry growth direction that can be well approximated by a [225] lattice vector. These quantum wells yield a 30\% spin-helix lifetime enhancement compared to [001]-oriented electron gases and, remarkably, require a negligible Rashba coefficient. The rotation axis of the corresponding spin helix is only slightly tilted out of the quantum-well plane. This makes the experimental study of the spin-helix dynamics readily accessible for conventional optical spin orientation measurements where spins are excited and detected along the quantum-well growth direction.

arXiv comment14 pages, 6 figures

References in corpus (39)

• Spintronics: Fundamentals and applications
• Non-ballistic spin field-effect transistor
• An Exact SU(2) Symmetry and Persistent Spin Helix in a Spin-Orbit Coupled System
• Emergence of the persistent spin helix in semiconductor quantum wells
• Weak Antilocalization and Spin Precession in Quantum Wells
• All-electric all-semiconductor spin field effect transistors
• Theory of Spin-Charge Coupled Transport in a Two-Dimensional Electron Gas with Rashba Spin-Orbit Interactions
• Direct mapping of the formation of a persistent spin helix: Supplementary information
• Ultrafast spin-lasers
• Persistent Spin Textures in Semiconductor Nanostructures
• Spin Hall effect and Berry phase in two dimensional electron gas
• Waveguide diffusion modes and slowdown of D'yakonov-Perel' spin relaxation in narrow 2-D semiconductor channels
• Spin-Hall and spin-diagonal conductivity in the presence of Rashba and Dresselhaus spin-orbit coupling
• Spin Splitting and Weak Localization in (110) GaAs/AlGaAs Quantum Wells
• Probing variations of the Rashba spin-orbit coupling at the nanometer scale
• Zitterbewegung of electrons and holes in III-V semiconductor quantum wells
• Spin relaxation in a generic two-dimensional spin-orbit coupled system
• Full Electrical Control of the Electron Spin Relaxation in GaAs Quantum Wells
• Anisotropic plasmons in a two-dimensional electron gas with spin-orbit interaction
• Experimental Demonstration of XOR Operation in Graphene Magnetologic Gates at Room Temperature
• Toward high-frequency operation of spin lasers
• Analytical Model of Spin-Polarized Semiconductor Lasers
• Persistent spin helix in Rashba-Dresselhaus two-dimensional electron systems
• Quantum World-line Monte Carlo Method with Non-binary Loops and Its Application
• Dynamics of a localized spin excitation close to the spin-helix regime
• Spin relaxation in narrow wires of a two-dimensional electron gas
• Control of Spin Helix Symmetry in Semiconductor Quantum Wells by Crystal Orientation
• Dimensional Dependence of Weak Localization Corrections and Spin Relaxation in Quantum Wires with Rashba Spin-Orbit Coupling
• Spin dynamics in rolled-up two dimensional electron gases
• Unified theory of spin-dynamics in a two dimensional electron gases with arbitrary spin-orbit coping strength at finite temperature
• Relaxation mechanisms of the persistent spin helix
• Spin relaxation of conduction electrons in (110)-grown quantum wells
• Spatiotemporal spin fluctuations caused by spin-orbit-coupled Brownian motion
• Spin drift and diffusion in one- and two-subband helical systems
• Persistent spin textures and currents in wurtzite nanowire-based quantum structures
• Hole Spin Helix: Anomalous Spin Diffusion in Anisotropic Strained Hole Quantum Wells
• Conserved Spin Quantity in Strained Hole Systems with Rashba and Dresselhaus Spin-Orbit Coupling
• Signatures of spin-preserving symmetries in two-dimensional hole gases
• Evolution of the persistent spin helix in the presence of Hartree-Fock fields

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• Cubic spin-orbit coupling and anomalous Josephson effect in planar junctions
• Spin pumping of two-dimensional electron gas with Rashba and Dresselhaus spin-orbit interactions
• Impact of the $p$-cubic Dresselhaus term on the spin Hall effect
• Reliable modeling of weak antilocalization for accurate spin-lifetime extraction
• Electron g-factor determined for quantum dot circuit fabricated from (110)-oriented GaAs quantum well